A control method for a heat exchanger

Abstract

The application provides a heat exchanger control method, the heat exchanger includes a shell, a fan arranged on the shell, a finned coil arranged in the shell, an evaporative cooling block arranged on the air inlet side of the finned coil and a spraying system for spraying water to the evaporative cooling block; the temperature of the high-temperature working medium flowing out is detected, the rotating speed of the fan inside the heat exchanger and the water spraying amount of the evaporative cooling block are adjusted in real time, and the temperature of the high-temperature working medium flowing out is ensured; the humidity and temperature difference are monitored in real time, the water supply amount is reasonably adjusted, the water film on the surface of the evaporative cooling block is prevented from being too thick to reduce the water evaporation effect, the evaporation efficiency of the evaporative cooling block is fully utilized, the heat exchange efficiency of the heat exchanger is improved, and whether the evaporative cooling block is blocked or damaged is automatically detected, so that personnel need not check the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchangers, in particular to a control method of a heat exchanger. BACKGROUND

[0002] In modern society, energy saving and environmental protection has been deeply involved in various aspects of production and life under the guidance of national policy. With the rapid development of cloud computing, 5G communication, edge computing, Internet of Things, artificial intelligence and other industries, the data center continues to grow at a high speed, and the use of IT equipment and server density increases day by day. About 40% of the energy consumption of data center is the refrigeration compressor unit for cooling the data center. The traditional cooling method is to use refrigeration compressor unit to cooperate with air cooler for air cooling.

[0003] In recent years, plate liquid cooling and immersion liquid cooling with higher heat transfer efficiency have been developed. Because of the use of direct contact heat transfer, plate liquid cooling and immersion liquid cooling are expected to reduce cooling power consumption by more than 30% to 40%.

[0004] The plate liquid cooling uses liquid cooling plate to transfer the heat of the processor to the heat carrier inside the liquid cooling plate, and the heat carrier transfers the heat to the secondary side circulating liquid through the circulating pump and the plate heat exchanger, and the secondary side circulating liquid transfers the heat to the natural environment through the heat exchanger.

[0005] The specific implementation of immersion liquid cooling is to immerse the processor in the cooling liquid. The cooling liquid that absorbs heat is pumped to the dry cooler by the pump, and the heat is transferred to the natural environment through the heat exchanger, so as to reduce the temperature of the cooling liquid and realize stable operation of the processor in the appropriate temperature range.

[0006] Plate liquid cooling and immersion liquid cooling will use dry coolers in water shortage areas. The dry cooler is a device that transfers the heat of the heat medium inside the dry cooler to the outside air through the low-temperature wind of the natural environment, and the outside air is discharged from the dry cooler under the guidance of the fan.

[0007] However, when the ambient temperature is high (such as summer), the heat exchange effect of the dry cooler is greatly reduced. In order to improve the use range of the dry cooler, water is sprayed in the form of mist into the air at the air inlet of the dry cooler or on the fins in the industry. However, because the air contains a large number of dust particles, these dust particles can gather into dirt after meeting water, blocking the fin air duct of the dry cooler. At the same time, the water consumption of the sprayed water will be very large. How to effectively reduce the inlet air temperature of the dry cooler in summer and prevent the dry cooler from being dirty and blocked has become a major problem restricting the popularization and use of the dry cooler. SUMMARY

[0008] The purpose of the present application is to solve the above problems, and provide a control method of a heat exchanger.

[0009] To achieve the above object, the application provides a control method of a heat exchanger, which comprises a shell, a fan arranged on the shell, a finned coil arranged in the shell, an evaporative cooling block arranged on the air inlet side of the finned coil, and a spraying system for spraying water to the evaporative cooling block.

[0010] The control method of the heat exchanger comprises the steps of,

[0011] S1, starting the heat exchanger, and starting the fan to rotate;

[0012] S2, detecting whether the temperature of the high-temperature working medium is greater than the set working medium temperature, if yes, entering the next step, and if no, waiting for a buffer time and then continuing to execute step S2;

[0013] S3, spraying water to the evaporative cooling block by the spraying system;

[0014] S4, detecting the outside wet bulb temperature ts1, the temperature t2 in the heat exchanger, and the relative humidity RH2 in the heat exchanger;

[0015] If RH2≥ the maximum humidity, and t2-ts1≤ the minimum temperature difference, entering step S5, and if not, waiting for a buffer time and then continuing to execute step S4;

[0016] If the maximum humidity> RH2≥ the minimum humidity, and the maximum temperature difference≥ t2-ts1> the minimum temperature difference, entering step S6, and if not, waiting for a buffer time and then continuing to execute step S4;

[0017] If RH2< the minimum humidity, and t2-ts1> the maximum temperature difference, entering step S7, and if not, waiting for a buffer time and then continuing to execute step S4;

[0018] S5, reducing the water amount sprayed to the evaporative cooling block by the spraying system, waiting for a buffer time, and then returning to execute step S4;

[0019] S6, keeping the current water amount sprayed to the evaporative cooling block by the spraying system, waiting for a buffer time, and then returning to execute step S4;

[0020] S7, increasing the water amount sprayed to the evaporative cooling block by the spraying system, and detecting whether the time of continuously increasing the spraying is greater than the set time, if yes, entering step S8, and if not, waiting for a buffer time and then returning to execute step S4;

[0021] S8, if RH2< the minimum humidity, and t2-ts1> the maximum temperature difference, entering step S9, and if not, waiting for a buffer time and then returning to execute step S4;

[0022] S9, shutting down the heat exchanger, and repairing the heat exchanger.

[0023] Further specifically, a step S21 is arranged between step S2 and step S3,

[0024] S21, detecting whether the fan speed can be increased, if yes, increasing the fan speed, and waiting for a buffer time, then returning to execute step S2, if no, entering step S3.

[0025] Further specifically, before increasing the water amount of the spraying system in step S7, it is detected whether the spraying system can increase the water amount of the spraying, if yes, increasing the water amount of the spraying, if no, executing step S9.

[0026] Further specifically, the wind pressure inside the heat exchanger and the wind pressure outside the heat exchanger are detected, if the pressure difference between the wind pressure outside the heat exchanger and the wind pressure inside the heat exchanger is greater than a set pressure difference, entering step S9, if less, sequentially executing.

[0027] Further specifically, the spraying system comprises a water supply spraying and a water circulation spraying;

[0028] The water supply spraying comprises a water supply pipeline in communication with the evaporative cooling block and a flow regulating valve arranged on the water supply pipeline;

[0029] The water circulation spraying comprises a water tank, a water pump arranged in the water tank and a circulation pipeline in communication with the evaporative cooling block, the circulation pipeline is in communication with the water pump, and the water tank collects the water from the water supply spraying.

[0030] Further specifically, in step S5, when the spraying system reduces the water amount of the spraying to the evaporative cooling block,

[0031] If it is the water supply spraying, the opening degree of the flow regulating valve is gradually reduced;

[0032] If it is the water circulation spraying, the rotating speed of the water pump is gradually reduced.

[0033] Further specifically, in step S7, when the spraying system increases the water amount of the spraying to the evaporative cooling block,

[0034] If it is the water supply spraying, the opening degree of the flow regulating valve is gradually increased;

[0035] If it is the water circulation spraying, the rotating speed of the water pump is gradually increased.

[0036] Further specifically, when the water level in the water tank reaches the highest water level, the opening degree of the flow regulating valve is adjusted to the minimum, and the water circulation spraying is opened; when the water level in the water tank reaches the lowest water level, the water circulation spraying is closed.

[0037] Further specifically, after the heat exchanger is closed, the water in the water supply pipeline and the circulation pipeline flows into the water tank.

[0038] Further specifically, a first detection assembly is arranged outside the heat exchanger, and a second detection assembly is arranged between the finned coil and the evaporative cooling block.

[0039] The first detection assembly and the second detection assembly are both connected with a control module in communication, and the control module controls automatic operation of the heat exchanger.

[0040] The application mainly designs a control method of a heat exchanger, adjusts the rotating speed of a fan inside the heat exchanger and the water spraying amount to the evaporative cooling block in real time by detecting the temperature of the high-temperature working medium, guarantees the temperature of the high-temperature working medium, adjusts the water supply amount reasonably by real-time monitoring of humidity and temperature difference, avoids the water film on the surface of the evaporative cooling block being too thick to reduce the water evaporation effect, fully utilizes the evaporation efficiency of the evaporative cooling block, improves the heat exchange efficiency of the heat exchanger, and automatically detects whether the evaporative cooling block is blocked or damaged without personnel checking the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0041] The exemplary embodiments of the application will be described in detail below with reference to the accompanying drawings, and it should be understood that the embodiments described below are only used to explain the application and do not limit the scope of the application, and the accompanying drawings are as follows:

[0042] Figure 1 is a flowchart of the application Figure 1 ;

[0043] Figure 2 is a flowchart structure of the application Figure 2 ;

[0044] Figure 3 is a structure diagram of the heat exchanger of the application

[0045] Figure 4 is a pipeline structure diagram of the heat exchanger of the application

[0046] In the figure: 1, fan; 2, finned coil; 3, evaporative cooling block; 41, first water supply pipe; 42, water distribution main pipe; 43, first water distribution pipe; 44, second water distribution pipe; 45, flow regulating valve; 46, water supply check valve; 50, water pump; 51, first circulation pipe; 52, filter; 53, circulation check valve; 54, water drainage branch pipe; 55, electromagnetic valve; 56, water tank; 57, water tank filter assembly; 58, upper water level detection; 59, lower water level detection; 61, first detection assembly; 62, second detection assembly. DETAILED DESCRIPTION

[0047] For the purposes of making the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0048] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0049] It should be understood that the drawings are only used to exemplarily illustrate the present application.

[0050] As shown in Figure 3 , Figure 4 , the heat exchanger comprises a shell, a fan 1 arranged on the shell, a finned coil 2 arranged in the shell, an evaporative cooling block 3 arranged on the wind side of the finned coil 2, and a spraying system for spraying the evaporative cooling block 3.

[0051] The fan 1 is arranged at the top of the shell and is used to introduce external wind into the shell. The wind outside the heat exchanger enters the inside of the heat exchanger through the evaporative cooling block 3, is heated after passing through the finned coil 2, and is then sent out by the fan 1.

[0052] The finned coil 2 is arranged in two groups in a V shape in the shell. High-temperature working medium enters from the liquid inlet of the finned coil 2, is heated, flows out from the liquid outlet, and is collected. After the high-temperature working medium flows out, a temperature sensor is arranged to detect the temperature of the high-temperature working medium flowing out, and the heating mode of the heat exchanger is adjusted according to the detected temperature. At present, the requirement for high-temperature working medium is that the temperature of the high-temperature working medium flowing out after heating should not exceed 40℃.

[0053] The evaporative cooling block 3 is arranged at the incoming air side of the finned coil 2 and simultaneously serves as the air inlet on both sides of the heat exchanger. Since the finned coil 2 is provided with two groups, the evaporative cooling block 3 is also provided with two groups, i.e., a first evaporative cooling block and a second evaporative cooling block, and of course, the number of the evaporative cooling blocks 3 is not limited. When the external incoming air enters the heat exchanger, it first passes through the evaporative cooling block 3, then passes through the finned coil 2, and finally is sent out of the heat exchanger by the fan 1. The material of the evaporative cooling block 3 can be paper, PVC or metal, and the water distribution performance of the surface thereof is excellent, so that the water can be fully wetted to the surface of the material and the evaporation of the surface water is promoted.

[0054] The spray system includes water supply spray and water circulation spray. The water supply spray is directly supplied with water from the external pipe network and sprays the evaporative cooling block 3. The water circulation spray collects the water from the water supply spray and stores it. When the water level reaches the upper water level, the water is sprayed to the evaporative cooling block 3. After the spray water wets the evaporative cooling block 3, the excess water flows downward. A beveled water pan is arranged below the evaporative cooling block 3 to receive the excess wet water and send the water into the water tank 56.

[0055] When the spray system is turned on, the water supply spray mode is first opened. When the external incoming water continuously sprays the evaporative cooling block 3, it also continuously flows into the water tank 56 and is stored in the water tank 56. When the water level in the water tank 56 reaches the upper water level, the upper water level detection 58 sends a signal, the opening degree of the flow regulating valve 45 is adjusted to the minimum, the water circulation spray is opened, and the water is mainly sprayed to the evaporative cooling block through the water circulation mode. However, in order to prevent the water in the water tank 56 from being insufficient and the water sprayed to the evaporative cooling block 3 from being insufficient, the flow regulating valve 45 is kept in the open state, but the water supply circulation is in the auxiliary spray state. When the water level in the water tank 56 reaches the lower water level, the lower water level detection 59 sends a signal, the water circulation spray is closed, and the opening degree of the flow regulating valve 45 is adjusted according to the temperature of the high-temperature working medium flowing out.

[0056] The water supply spray comprises a water supply pipeline in communication with the evaporative cooling block 3, a flow regulating valve 45 arranged on the water supply pipeline, and a water supply one-way valve 46 for ensuring one-way flow of water; the water supply pipeline comprises a first water supply pipe 41 arranged in communication and a water supply branch pipe, the first water supply pipe 41 is in communication with an external pipe network, and the water supply branch pipe comprises a water distribution main pipe 42, a first water distribution pipe 43, and a second water distribution pipe 44; the water distribution main pipe 42 is in communication with the first water supply pipe 41, receives water from the first water supply pipe 41, and uniformly delivers water to the first water distribution pipe 43 and the second water distribution pipe 44; the first water distribution pipe 43 sprays water to the first evaporative cooling block, and the second water distribution pipe 44 sprays water to the second evaporative cooling block; the flow regulating valve 45 and the water supply one-way valve 46 are arranged on the first water supply pipe 41, and the water amount sprayed to the evaporative cooling block 3 is adjusted by adjusting the flow regulating valve 45.

[0057] The water circulation spray comprises a water tank 56, a water pump 50 arranged in the water tank 56, and a circulation pipeline in communication with the evaporative cooling block 3; the circulation pipeline is in communication with the water pump 50, and the water tank 56 collects water from the water supply spray. The bottom of the water tank 56 is arranged in an inclined manner, a water tank filtering assembly 57 is arranged on the inclined surface of the water tank 56, water flowing through is fully filtered and then flows into the water tank 56, and the bottom surface of the water tank 56 is designed in an inverted U shape, facilitating water collection. An upper water level detector 58 and a lower water level detector 59 are arranged in the water tank 56; when the upper water level detector 58 detects that the water level reaches an upper water level, the water pump 50 is started to spray water collected in the water tank 56 to the evaporative cooling block 3 through the circulation pipeline, and the opening of the flow regulating valve 45 is adjusted to the minimum, so as to fully utilize the accumulated water in the water tank 56; when the lower water level detector 59 detects that the water level decreases to a lower water level, the water pump 50 is closed, and the opening of the flow regulating valve 45 is increased.

[0058] The circulating pipeline comprises a first circulating pipe 51 and a circulating water distribution pipeline in communication with the first circulating pipe 51, and the circulating water distribution pipeline has the same structure as the water supply distribution pipeline, of course, the circulating water distribution pipeline and the water supply distribution pipeline can also be provided with only one, further, in the present scheme, the circulating water distribution pipeline and the water supply distribution pipeline have the same structure, and the first circulating pipe 51 is in communication with the water distribution main pipe 42. A filter 52 and a circulating one-way valve 53 are arranged on the first circulating pipe 51, for re-filtering the accumulated water in the water tank 56, so as to avoid the impurities in the water from polluting the evaporative cooling block 3 as much as possible. After the equipment is shut down, the water in the pipeline needs to be transported into the water tank 56, but because the circulating one-way valve 53 is arranged, a water drainage branch pipe 54 is led out on the first circulating pipe 51, the water inlet of the water drainage branch pipe 54 is arranged on the water outlet side of the circulating one-way valve 53, the water outlet of the water drainage branch pipe 54 is arranged on the water inlet side of the circulating one-way valve 53, and an electromagnetic valve 55 is arranged on the water drainage branch pipe 54, so as to open or close the water drainage branch pipe 54 through the electromagnetic valve 55. After the heat exchanger is closed, the water in the water supply pipeline and the circulating pipeline flows into the water tank 56 for storage through the water drainage branch pipe 54.

[0059] In order to monitor in real time whether the heat exchanger needs to be cleaned or maintained, a first detection assembly 61 is arranged outside the heat exchanger, and a second detection assembly 62 is arranged between the finned coil pipe 2 and the evaporative cooling block 3; the first detection assembly 61 comprises a first temperature sensor for detecting the external environment temperature, a first humidity sensor for detecting the external environment humidity, and a first pressure sensor for detecting the external wind pressure; the second detection assembly 62 comprises a second temperature sensor for detecting the internal environment temperature of the heat exchanger, a second humidity sensor for detecting the internal environment humidity of the heat exchanger, and a second pressure sensor for detecting the internal wind pressure of the heat exchanger.

[0060] Meanwhile, a control module is arranged, which is in signal connection with all the components in the heat exchanger, including but not limited to the first detection assembly 61 and the second detection assembly 62, and receives signals from the components in the heat exchanger, so as to automatically control the operation of the heat exchanger.

[0061] In order to further ensure that the temperature of the high-temperature working medium flowing out of the finned coil pipe 2 is less than or equal to 40℃, the heat exchanger is controlled to be adjusted, and the control method of the heat exchanger is as shown in Figure 1 、 Figure 2 , which comprises the following steps,

[0062] S1, the heat exchanger is started, the fan 1 starts to rotate, and the external wind is discharged from the fan 1 after passing through the evaporative cooling block 3 and the finned coil pipe 2 in turn, and the external low-temperature wind exchanges heat with the high-temperature working medium in the finned coil pipe 2 when passing through the finned coil pipe 2;

[0063] S2, after the high-temperature working medium flows out after heat exchange with the external low-temperature air, the temperature sensor detects the temperature of the high-temperature working medium flowing out, and judges whether the temperature of the high-temperature working medium is greater than the set working medium temperature, the set temperature is set to 40℃, if yes, the next step is entered, if not, after waiting for a buffer time, step S2 is continuously executed;

[0064] S21, when it is detected that the temperature of the high-temperature working medium flowing out is greater than 40℃, whether the fan 1 rotating speed can be increased is detected, if yes, the fan 1 rotating speed is increased to improve the heat exchange effect on the high-temperature working medium, and after a buffer time, step S2 is returned to be executed, if not, it is indicated that the heat exchange on the high-temperature working medium cannot be completed only by the fan 1, then step S3 is entered.

[0065] S3, the spraying system sprays the evaporative cooling block 3, while ensuring that the fan 1 does not stop and keeps the current rotating speed;

[0066] S4, the first temperature sensor detects the temperature t1 of the external environment, the first humidity sensor detects the relative humidity RH1 of the outside, the second temperature sensor detects the temperature t2 in the heat exchanger, and the second humidity sensor detects the relative humidity RH2 in the heat exchanger, and the external wet bulb temperature ts1 is calculated through the above data;

[0067] The calculation formula of the wet bulb temperature ts is as follows:

[0068] ts=C×RH+D×t

[0069] In the formula, RH is the relative humidity of air, 100%

[0070] t is the dry bulb temperature of air, ℃

[0071] C and D are calculation coefficients, see Table 1

[0072] Table 1

[0073]

[0074] If RH2≥maximum humidity, and t2-ts1≤minimum temperature difference, step S5 is entered, if not, after waiting for a buffer time, step S4 is continuously executed;

[0075] If maximum humidity> RH2≥ minimum humidity, and maximum temperature difference≥t2-ts1> minimum temperature difference, step S6 is entered, if not, after waiting for a buffer time, step S4 is continuously executed;

[0076] If RH2< minimum humidity, and t2-ts1> maximum temperature difference, step S7 is entered, if not, after waiting for a buffer time, step S4 is continuously executed;

[0077] S5, the spraying system reduces the amount of water sprayed to the evaporative cooling block 3;

[0078] If the spray mode of the spray system is water supply spray, the opening of the flow regulating valve 45 is gradually decreased, and if the spray mode of the spray system is water circulation spray, the rotating speed of the water pump 50 is gradually decreased, and after a buffer time, the step S4 is returned to be executed;

[0079] The water circulation spray is the mode opened after enough water from the water supply spray is collected. Whether the water supply spray needs to be started after the water pump 50 is closed depends on whether the water in the water tank 56 is enough. If the water in the water tank 56 does not reach the lower water level when the water pump 50 is closed, the opening of the flow regulating valve 45 is gradually decreased until it is closed. If the water in the water tank 56 reaches the lower water level when the water pump 50 is closed, the opening of the flow regulating valve 45 is adjusted according to the detection result of the step S4;

[0080] S6, the spray system keeps the current water amount sprayed to the evaporative cooling block 3;

[0081] If the spray mode of the spray system is water supply spray, the opening of the flow regulating valve 45 is kept, and if the spray mode of the spray system is water circulation spray, the rotating speed of the water pump 50 is kept, and after a buffer time, the step S4 is returned to be executed;

[0082] S7, it is detected whether the spray system can increase the water amount sprayed. If yes, the spray system increases the water amount sprayed to the evaporative cooling block 3, and it is detected whether the time of continuously increasing the spray is greater than the set time. If no, the step S9 is executed;

[0083] If the spray mode of the spray system is water supply spray, the opening of the flow regulating valve 45 is gradually increased, and if the spray mode of the spray system is water circulation spray, the rotating speed of the water pump 50 is gradually increased;

[0084] After the water amount sprayed is increased, it is simultaneously detected whether the time of continuously increasing the spray is greater than the set time. If yes, the step S8 is entered, and if no, after a buffer time, the step S4 is continuously executed;

[0085] Since the opening of the flow regulating valve 45 is adjusted to be minimum after the water pump 50 is opened, if the water amount sprayed still needs to be increased after the rotating speed of the water pump 50 is adjusted to be maximum, the opening of the flow regulating valve 45 is gradually increased. If the opening of the flow regulating valve 45 and the rotating speed of the water pump 50 are both adjusted to be maximum, the step S9 is executed;

[0086] If the water in the water tank 56 reaches the upper water level during the process of adjusting the water amount sprayed, the water supply spray is changed to the water circulation spray, and the water amount sprayed of the two needs to be kept consistent;

[0087] The detection of the continuous increase of the spraying time refers to that all the operations of the spraying water amount are increasing the spraying water amount within the set time. That is, if ten operations are performed within the set time, the ten operations must all be increasing the spraying water amount. If any operation is not increasing the spraying water amount, for example, the first to sixth operations are all increasing the spraying water amount, the seventh operation is maintaining the current water amount, and the eighth operation is increasing the water amount, then the eighth operation is the first time of a new round, and the set time is restarted to be calculated.

[0088] S8, if RH2< minimum humidity and t2-ts1> maximum temperature difference, it is indicated that the temperature difference is still greater than the maximum temperature difference and the humidity is still less than the minimum humidity when the spraying amount is adjusted to the maximum, further indicating that the heat exchanger is malfunctioning, then step S9 is entered, and if not, the buffer time is returned to execute step S4;

[0089] S9, the heat exchanger is shut down for maintenance.

[0090] After increasing the fan 1 speed or increasing the spraying water amount, the temperature of the outflowing high-temperature working medium will not change immediately, and a certain time needs to be waited before detection. In the present scheme, the waiting time is the buffer time, which is set to 30 seconds. Of course, the waiting time can be adjusted as needed.

[0091] The set time in step S7 is 5 minutes. Of course, the set time can be adjusted as needed.

[0092] In the present scheme, the minimum humidity is 80%, and is represented by RH min ; the maximum humidity is 95%, and is represented by RH max ; the minimum temperature difference is 1, and is represented by t min ; the maximum temperature difference is 3, and is represented by t max ; of course, the above data can be adjusted as needed.

[0093] In the control process of the heat exchanger, the air pressure inside the heat exchanger and the air pressure outside the heat exchanger can be detected at any time. If the pressure difference between the outside air pressure and the inside air pressure is greater than the set pressure difference, step S9 is directly entered. If the pressure difference between the outside air pressure and the inside air pressure is less than or equal to the set pressure difference, the corresponding steps are sequentially executed. The set pressure difference is 50 Pa.

[0094] The application mainly designs a control method of the heat exchanger, adjusts the rotating speed of the fan 1 in the heat exchanger and the spraying water amount of the evaporative cooling block 3 in real time by detecting the temperature of the high-temperature working medium, guarantees the temperature of the high-temperature working medium, adjusts the water supply amount reasonably by monitoring the humidity and temperature difference in real time, avoids the water film on the surface of the evaporative cooling block 3 being too thick to reduce the water evaporation effect, fully plays the evaporation efficiency of the evaporative cooling block 3, improves the heat exchange efficiency of the heat exchanger, and automatically detects whether the evaporative cooling block 3 is blocked or damaged without personnel checking the equipment.

[0095] The preferred embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the application within the technical concept of the application, and these simple modifications all belong to the protection scope of the application.

[0096] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the application will not further describe various possible combinations.

[0097] In addition, various different embodiments of the application can also be combined in any manner, as long as it does not deviate from the idea of the application, and it should also be considered as disclosed by the application.

Claims

1. A control method of a heat exchanger, characterized by: The heat exchanger comprises a shell, a fan (1) arranged on the shell, a finned coil (2) arranged in the shell, an evaporative cooling block (3) arranged on the air inlet side of the finned coil (2), and a spraying system for spraying water to the evaporative cooling block (3); The control method of the heat exchanger comprises the steps of, S1, starting the heat exchanger, and rotating the fan (1); S2, detecting whether the temperature of the high-temperature working medium flowing out is greater than the set working medium temperature, if yes, proceeding to the next step, if no, waiting for a buffer time and then continuing to execute step S2; S3, the spraying system sprays water to the evaporative cooling block (3); S4, detecting the outside wet bulb temperature ts1, the temperature t2 in the heat exchanger, and the relative humidity RH2 in the heat exchanger; If RH2≥ the maximum humidity, and t2-ts1≤ the minimum temperature difference, then proceeding to step S5, if not, waiting for a buffer time and then continuing to execute step S4; If the maximum humidity > RH2≥ the minimum humidity, and the maximum temperature difference ≥ t2-ts1> the minimum temperature difference, then proceeding to step S6, if not, waiting for a buffer time and then continuing to execute step S4; If RH2< the minimum humidity, and t2-ts1> the maximum temperature difference, then proceeding to step S7, if not, waiting for a buffer time and then continuing to execute step S4; S5, the spraying system reduces the amount of water sprayed to the evaporative cooling block (3), and waits for a buffer time and then returns to execute step S4; S6, the spraying system keeps the current amount of water sprayed to the evaporative cooling block (3), and waits for a buffer time and then returns to execute step S4; S7, the spraying system increases the amount of water sprayed to the evaporative cooling block (3), and simultaneously detects whether the time of continuously increasing the spraying is greater than the set time, if yes, proceeding to step S8, if not, waiting for a buffer time and then returning to execute step S4; S8, if RH2< the minimum humidity, and t2-ts1> the maximum temperature difference, then proceeding to step S9, if not, waiting for a buffer time and then returning to execute step S4; S9, shutting down the heat exchanger, and repairing the heat exchanger.

2. The control method of a heat exchanger according to claim 1, characterized by: A step S21 is arranged between step S2 and step S3, S21, detecting whether the rotating speed of the fan (1) can be increased, if yes, increasing the rotating speed of the fan (1), waiting for a buffer time, and then returning to execute step S2, if not, proceeding to step S3.

3. The control method of a heat exchanger according to claim 1, characterized by: In step S7, before increasing the amount of water sprayed, it is detected whether the spraying system can increase the amount of water sprayed, if yes, continuing to execute step S7, if not, executing step S9.

4. The control method of a heat exchanger according to claim 1, characterized by: In steps S1-S8, the air pressure inside the heat exchanger and the air pressure outside the heat exchanger are detected, and it is judged whether the pressure difference between the outside air pressure and the inside air pressure is greater than the set pressure difference, if yes, proceeding to step S9, if not, continuing to execute sequentially.

5. The control method of a heat exchanger according to claim 1, characterized by: The spraying system comprises a water supply spraying and a water circulation spraying; The water supply spraying comprises a water supply pipeline in communication with the evaporative cooling block (3), and a flow regulating valve (45) arranged on the water supply pipeline; The water circulation spray comprises a water tank (56), a water pump (50) arranged in the water tank (56), and a circulation pipeline in communication with the evaporative cooling block (3), the circulation pipeline being in communication with the water pump (50), and the water tank (56) collecting water for the water supply spray.

6. The control method of a heat exchanger according to claim 5, characterized by: In step S5, when the spray system reduces the amount of water sprayed to the evaporative cooling block (3), If the water supply spray, gradually reduce the opening of the flow regulating valve (45); If the water circulation spray, gradually reduce the rotating speed of the water pump (50).

7. The control method of a heat exchanger according to claim 5, characterized by: In step S7, when the spray system increases the amount of water sprayed to the evaporative cooling block (3), If the water supply spray, gradually increase the opening of the flow regulating valve (45); If the water circulation spray, gradually increase the rotating speed of the water pump (50).

8. The control method of a heat exchanger according to claim 5, characterized by: When the water level in the water tank (56) reaches the upper water level, the opening of the flow regulating valve (45) is adjusted to the minimum, and the water circulation spray is turned on; when the water level in the water tank (56) reaches the lower water level, the water circulation spray is turned off.

9. The control method of a heat exchanger according to claim 5, characterized by: After the heat exchanger is turned off, the water in the water supply pipeline and the circulation pipeline flows into the water tank (56).

10. The control method of a heat exchanger according to claim 1, characterized by: A first detection assembly (61) is arranged outside the heat exchanger, and a second detection assembly (62) is arranged between the finned coil (2) and the evaporative cooling block (3); The heat exchanger is further provided with a control module, the first detection assembly (61) and the second detection assembly (62) are in communication with the control module, and the control module controls the automatic operation of the heat exchanger.

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